I believe our goal is to try to reproduce what we hear in real life. meaning tonality and harmonic structure.
Live music such as my trumpet our Son's Guitar or me banging away on a cymbal or snare help to determine how close we got to the real deal.
Live acoustic music such as a piano, violin, harpsichord will let you know rather quickly how close or far away one is with their system.
Years ago for a Club meet we recorded a guitar player positioned in between my main speakers on a stool. Using a Sony Mini Disc recorder the results were not a different as we thought. Good for me. Now a small ensemble or Orchestra would show more than a single instrument but that was impossible to accomplish in house.
What really got our gander was when we assembled an outdoor system with Maggie 3As. The openness , clarity, tone and harmonics took all away. We were very surprised as to the result. Rooms suck. He he.
Anyway, yes we are after Hi Fidelity however compared to live.
charles